Just a thought on what might be hitting. I had a t-chain cover that had a chain that was way loose with the guides broken all the way. Not the case here, but it's something else that hit so I thought I'd add. The chain had broken off part of the cover on the bottom. It's like a guide cast into the cover. Here is where I'm talking about, where the red dot is, but on the back side where the chain is.

[Linked Image]

I wish I had a better picture, but I broke my digital camera.

Again, just an idea of somewhere it could hit.

Fur clog in the sausage grinder